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The iOptron counterweights are quite cheap compared to many others. Under $100 for a 5kg counterweight and they come with a 28mm bore.
I machined a similar sleeve from $3 worth of solid bar for my 18mm Takahashi mount in preference to buying a $250 Takahashi counterweight.
If Sirius can print these sleeves, then this is a good option combined with the iOptron counterweights that with their large bore can be adapted to most other common diameters.
Good one Ashley!
Joe
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